Thousands of U.S. Immigration and Customs Enforcement officers are caught in a disagreement between President Donald Trump and Homeland Security Secretary Markwayne Mullin over ICE’s ability to conduct traffic stops, all while sentiment about the president’s second DHS boss turns negative among some of the president’s closest supporters.

In the wake of two ICE-involved fatal shootings of illegal immigrants in Texas and Maine in one week, Mullin directed ICE officers to stop pursuing vehicles when attempting to make arrests. The move was announced internally by ICE’s Enforcement and Removal Operations assistant director for field operations and took effect Tuesday morning.